DTC P30DF-62: Backup Boost Converter Circuit Board (Thermistor) Signal Compare Failure; DTC P30EF-4B: Backup Boost Converter Circuit Board Over Temperature; DTC P323A-00: Backup Boost Converter "A"; DTC P323A-16: Backup Boost Converter "A" Circuit Voltage Below Threshold; DTC P323A-A2: Backup Boost Converter "A" System Voltage Low; DTC P323B-29: Backup Boost Converter "A" Control Circuit Signal Invalid; DTC P323B-38: Backup Boost Converter "A" Control Circuit Signal Cycle Invalid [12/2019 - 10/2022]: Description

Refer to DTC P323A-19.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
P30DF-62	Backup Boost Converter Circuit Board (Thermistor) Signal Compare Failure	The following conditions is met for 1 second or more (1 trip detection logic): Difference in temperature between thermistor 1 and thermistor 2 of the engine stop and start ECU is 40°C (72°F) or higher.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P30DF
P30EF-4B	Backup Boost Converter Circuit Board Over Temperature	The following conditions is met for 1 second or more (1 trip detection logic): Engine stop and start ECU thermistor temperature is 135°C (275°F) or higher.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P30EF
P323A-00	Backup Boost Converter "A"	The following conditions is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P323A
P323A-16	Backup Boost Converter "A" Circuit Voltage Below Threshold	One of the following conditions is met for 2 second or more (1 trip detection logic): B41 or IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected. B42 or B43 voltage is 6.0 V or less, backup boost converter is not overheating and backup boost converter output overcurrent is not detected.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P323A
P323A-A2	Backup Boost Converter "A" System Voltage Low	The following conditions is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P323A
P323B-29	Backup Boost Converter "A" Control Circuit Signal Invalid	The following conditions is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P323C
P323B-38	Backup Boost Converter "A" Control Circuit Signal Cycle Invalid	The following conditions is met for 1 second or more (1 trip detection logic): Backup boost converter malfunction is detected.	Wire harness or connector Battery BBC NO. 1 fuse BBC NO. 2 fuse Engine stop and start ECU	Blinks	DTC stored	SAE Code: P323C